Apparatus for forming sheet metal forms



July 25, 1933- J. L. AUBLE 1,919,287

APPARATUS FOR FORMI-NG SHEET METAL FORMS Filed Nov. ,27, 1931 5Sheets-Sheevt l July 25, 1933.

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July 25, 1933. 1 L AUBLE 1,919,287

APPARATUS FOR FORMING SHEET METAL FORMS 4 a 4 d 4/5 INVEN OR. j! .162. Z

ATTORNEYS.

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' ment of my invention.

Patented July 25, 1.933

i UNITED STATES PATENT oI-"I-IC15.'N 7 l JAMES' LAWRENCE AUBLE,CFCINCIINNATI, oiio, `AssICfNon, To M. a A. fine., 0F

CINCINNATI, o1-11o,A CORPORATION or omo v I `APPARATUS ron ron-MINGSHEET METALFORMS application med Noveiber 27, 1931.` serial No. 577,467;

My invention relates to 'theiartot drawingV and forming sheet metal intoforms'bya series of forming operations wit-hout removing the'piece beingformed Yfrom the drawing andfor'ming means. I Y

It is an object of my invention to provide a drawing and forming devicefor forming sheet metal into various forms by'continued movement in onedirection whilethe various parts constituting the forming deviceautofmatically adjust themselves in proper rela# tion to the movementsnecessary to complete theforming operation.

Another object of my invention is to have afforming device oftelescoping parts rotatable relative one to the other, and which adjustthemselves automatically in proper position while the forming operationisin progress to completion.

` A further object is to provide a forming device lfor sheet metal formshaving telescoping-rotative parts whichwill act in sequence andVposition themselves so as to permit the formation of the objects formedin sequential operations 4without removing the piece from the formingdevice until it has been completely formed. n

Broadly itis the object of my invention to provide a plunger typedrawing Land forming tool comprising a male' plunger with internalmaster shapes adapted to force metal discs into the rfemale partfof theforming means, elements within the female part comprising a plurality ofrotatable telescoping members with helical guiding means to auto-Vmatically position t-he members in proper position for the various'steps essential in the forming operation, and thereby eliminate thenecessity of removing the piece being formed from the device until theforming operation has been completed. n

' These and other objectswill be `more specifically pointed out in thespecifications and the drawings forming part of this speciiica-` tion,`and villustrating a In the drawings Figure 1 is a side elevationwithpartsfin section showing the device ready to receive a piece ofsheetfmetal lfor forming.

preferred embodi- .provided in the bolsterblock.

portion `7b provides val shoulder '7C forvcontact Figure 2 is aperspective of a form to be made by the device. .l l

Figure 2a` is a side elevation of the device showing the lirst step offorming after shearing the metaldisc. i e Y y Figure 3 is an elevationin section showing another step in the forming operation.

A Figure 4 is a side lelevation with parts in section` showingtheposition of the parts at' the completion of the formingl operation.

Figure '5 is a planin section taken on the line 5 5 of Figure 1*.i .Y

Fgu're 6 is a plan of one of the telescoping parts having internalhelical guiding means. Figure 7 is an Velevation in section taken on theline'7lf7 of Figure 6'. Y

Figure 8 is atop plan of another telescoping member `to which isattached thetrip finger.. y, t y I y -Figure 9 is a side elevation ofthemember shownin Figure 8; i y,

,F'gure 10. isla front elevation of the cam operating the trip. f

` Figure l1 is asideelevationv with part in section of the cam operatingthe trip.

A. Figure 12 is a plan vviewof the blank holder. y

Figure 13 is a side elevation of the fblank holder.' f I Figures 14 to17 inclusive are sectional Views showing the type of formiing deviceintended for use on a toggle press,v and the various Vpositions takenbythe parts in the act of forming a metal shell.

Afmain bolster block 1 consists of a base la vand. an upwardly extendingbosslb having a cavity 1C for retaining the parts of the forming device.The bottom 2 of the cavity has athreaded holef, 'vertical springretaining `pockets 3a, an elongatedslot and hole 3b for a cam'rod 4, andotherholes 3C for piston rods 5L Fixed to the base of the bolster blockis a downwardly extending boss 6 with an inner bore 6a to provide ahydraulic cylinder 6b for apistonc.v f U a v A lstationary centrallylocated forming i member 7 has a threaded portiona for securing it byscrewing intothe threaded hole A cylindrical l with the bottom of thecavity in the bolster block. The surface 8 of the cylindricalstudportion provides a bearing for atelescoping member.l The forming part ofthis member in thisicase has a shape similar to a mushroom.k A shoulderc on the underside of the mushroom shape of this member acts a stop andlimits the upward movement ofatelescoping member. A center hole Tf, thetop of which pub-vides a shearing edge for a piercing die, extendsr*through the full length of the stationary member. Blanks pierced inthis hole allrthrough to a pocket 7g and are discharged through anopeningh` provided in the bolster block.

While only two telescoping members have been illustrated, it willreadily occur to those skilledin the art to decrease or increase thenumber" of telescoping members,r depending upon the contour of the`orm'required. In this case the inner telescoping member has a flangeQintegral with which is a trip linger {Qa'extending beyond the Vsurface9b' of the frange. The base 9c of the telescoping member is slidablewhile rotating on the bottom of the cavity. Extending upwardly and inntegral with the base is altube 10. VOn the f outer surface of the ltubeare fixed sections 10a of aniultiple helix. The proper angle of the offthe Vflange ofthe inner telescoping mem- Y 'co ber extends downwardlyand is slidable in an annular groove 1122 in thebolster block. This Vpinis acted upon by a compression spring 11ev retained within ythe groove,and the spring in turn reacts against a {ixed abutment 11d shown as apin also within the groove.

The other telescoping member has a sleeve 12 with a hole 12a on'thesurface of which are extending' sections 1Q?) of multiple helixes. Theangle of these lielixes will correspond tov the angle on the lirstdescribed telescoping member, so that theykcan comeinto mesh and slidealong leach other. This member is sl-idable vertically on the othertelescopingmember. The'sleevehas two dii'l'erent diameters 12d and 12e,the top edge 127e of the largest "of the two diameters. providing ashearing for excess material of thc'blmk.`V Inte- `gal with and at thebottom of the'sleeve is av flange13 in which are lixed downwardlyextending plunger rods 13a. Thel rodshave heads 13b slidable in thespring pockets 3a and the heads rest on the springs 130, also connnedwithin the pockets 3a. Other clear- Vledge 15g which acts as astoptolimit This inner telescopingmember ance holes 13d are provided inthe flange in which piston rods 5 are tree to slide. An

elongated clearanceslot lill is provided for theY Vcam rod 4.' This slotpermits downward movement of the cam.

Y The blank Vholder is a ring la-witha hole 15?) so that it can slidedown over the surface 12e Vof the telescopingmember 12. Fixed to theunderside 15o of thev blank holder are spaced piston rods 5. One ofthese rods has an elongated notch 15d so that the trip finger 9a willnot be: interfered with while being moved by the cam.

Theouter surface of the ring is provided with two different diameters15e and 157e.

The diameter 15]e is slidable within a hole 16 of a 'blanking'die 'whichvwill be later explained. Thefother diameter 15e providesl a t 1e upwardmovement of theI blank holder.v .As previously stated, the piston isrigidly secured to the piston rods at 15h.

A counterbore'l is provided in thefbolster l block for'securin'g thereina blanking die. 17

with a central opening 17a having a shearing edge 17?), A shoulder17cbeneath the shearing edge is provided as stop means against which theledge 15g comes in Contact to limit the upward'mo-vement of the blankholder.

The inner surface 17d of the hole providing the cutting edge acts as aguide for the blank holder and alsoas a punch. The die remainsstationaryvat alltimes. *L f V The cam rod l has a hole 18 for spring18a. A plug'lS) with a hole18c slidably retains a plunger shank 19 ywitha head 19a that compresses the spring whenever'theend 196.01? theplunger shank bea-rs onfthe piston.

The plug'is ixe'd in the hole in the end of the rodV and prevents thespring from ejecting the `plunger; The upper end 190 has a rectangularextension 20, one face 20a beingvertical and parallel to the centralaxis of the rod.Y A sloping surfaceQOb connects the vertical facer withthe rod andactsas alcamY surfaceto rotate-the' inner telescopingmemberby contact with the trip on this said inner telescoping member. l At thetop ofthe'cam rod a tapped hole vis provided 'for an adjusting screw 21having a lock nut 21ato hold it in a set position. The cam rodisslidably mounted inthe hole 3b inthe bolster block. Itis moveddownwardly. by the blank holder and upwardly by the piston that actuatesthe blank holder. i

The plunger or male forming member when assembled is rigidly attached tothe ram of a' suitable press not shown). It comprises va punchholder22fhaving a circular'hub 22a,

with a counterbore 22?) and a central hole 220. Integraly with the hubisl a` flangerv 23 also provided with a counterboreV which centrallylocatesa combined punch and forming member which .will be laterexplained. ',Holes 24: are provided' for screws which Ysecure' the .im y

' are slidably 'retained'therein punch rand forming'member to the iange.Other holes are provided `for rods 26 that These rods are rigidlyattached to a plate' 27 that is slidably mounted within the counterbore225.' On

the upper side of the plateis a stud 27a that is rigidly attachedtotheplate. This stud comes into Contact with a part of the press ramandcauses the plate with` itsrods to move downward and push on a stripper.s

The combination punch and forming member 28 is rigidly secured in thecounterbore 29 by screws iu its flangey port-ion 28a. An extending boss30v is cylindrical in shape andV yis free to slide in the hole intheblank holder.

The bottom edge 30a is constructed to provide a shearing edgeforblankspto be cutl from sheet material. The upper( end 30b'iscounterbored to receive a 'plunger to bedescribed. Another hole 300 isprovided as' a bearing `for the plunger and connect-'s the counter-borewith the lower end 30d of the plunger. Thelower end will be'machined tothe outside contour of a particularform whiclnfin this case, is shown at3l, and consists of concentric rings Sla'and 316, joined together by-ashoulder Blogand terminating in a cone-shaped top 31d. y I

The ej-ecting plunger 32 has a sleeve-like portion 32a slidably mountedin the hole 30C. Integral withvthe sleeve-like portion isa hub 32?) thatis slidably mounted in (the counterbore inthe upper end of t-h'e'punch.In the" center of the plungerthere is a hole 32e' for slidablyretaininga piercing punch 33. shoulder 32d limits the movement of theejecting plunger when it comes intoA contact with the base fof thecounterbore.v

' The piercing punch has a rshank afwhich is pressed and fixed withinthe hole 220 provided in the punch holder. The top end. 337) -of theshank abuts against a'sho'ulder 34 pro,-

vided in the hole 22e. Thelower end 330 of the shank is slidably mountedinthe. hole 300 in the ejecting plunger. The 'bottom end 33d is thepiercing end of the punch.` i

A brake shoe 37 rigidly fastened to a rod 37a Ibears against the outersurface of the 'flange of the inner tele-scoping member. The rod' 37a isslidably mounted in a hole 38 in,

the boss of the bolster block. ThefendfSa is threaded lfor adjustingnuts-386 that bear against a compression springg39"slidablvA mountedonthe end of the rod. AfU-shaped band 40 is rigidlyattached to the bossof the Vbolster block and the inner side 40a. acts 'as 'an `abutmentforfth'e spring which is always Vholdinr1 the brake shoe in contact withtheA flange on the telescoping member. Y

An alternative type of forming tool which is intended for useon a togglepress 'will ,now be described. In this forming tool the operation andthe part-s are inverted when compared with respect to the tool ustdescribed. It consists of a bolster block 4ly havinga hol- 4The punch,asin" the first described Vin the opening 480.

low boss 41a and a `flange '416. Internally within the hollow bossismounteda` female Adie block 42 having a central hole 42a'with`varyingdiameters`42b, 42e and 42d. The two `upper diameters terminateinbeveledshoulders 43 and 43a. A top edge 43?) of the largest diameterprovides la'shearin'g edge.

Lwill be attached to atoggle actuated lram of af toggle 'press1 (notshown).` Rigidlylatdevice,

tachedV tothe movable `part of theram 1s a plate 44 having a hole 44atherein. yOn the top t 44?),fixedly attached, is a beveled cam' member.440. O-n the underside 44d. is fixed-'a flange .45'y integral withacylinder"45z extending from the flange.' -A tapped hole 456 for an. ylairinlet tube 45o is provided on the side of the cylinder. A discpiston 46 is slidably mounted within'the.l cylinder, and has a hole 46athat bearsandis slidable on the outersurface of one forming member to beexplained; f

` The forming member y47 is rigidlyl fasf tened in the fiange 45. Ithas'a beveled edge 47av and fa central "hole 47?); This forming memberperforms the shearing of thedisc and the first step in the forming of'ashell, as

forms the: second step in thev forming opera`` tion. A vertical shaft 49is slidablymounted a shoulder 495 against which a sleeve 50 rests.

This sleeve is xed on the shaft. On. the outer y "V""' surfacefandat thelower jend 50a there is a helix 506 which can mesh with -theotherhelixon thesecond forming member.

f Slidably mountedon the sleeve is a collarl,`

with an extending "finger 52 With'a sloping surface`52a. It is seated onthel top edgef52`b ofjthersecond forming member, as shown in Figure 14.This collar rotates the 'sleeve' by means of a key 54 Vfixed inthe'sleeve'an'd `meshing in a slot 55 in the collar and brings the twohelixes int-oposition so that'the sleeve and the secon d forming membercan telescope upon eachother. y y Y y i i. Oplertz'oajof first formingtool Figure l shows the position of all parts at The upper end 49d of..this shaft is smaller in diameter andiprovides the beginning oftheforming operation and shown von top ofthe die. Thej'blank holder7telescoping member and the cam are in the exa sheet of metal, indicatedin dotted linesfis f Y treme upper positions. The teleseopingmem-` ber12 isresting on the flattops of the'helixes -of the other telescopingmember.y The punch aud plunger part of thelforming tool'move.continuously during the forming operation.

Etheblank holder pushes-'the cam roddown--` blank holder. While movingdown,

v12 will slide down over the inner The firstv forming operation isaccom-v plished -by forcing the metal downover the .top of thetelescoping member 12 and up into thel largest diameter of the plunger(see Fig. 2a). While thisv operation isY taking place,

' l wai-d and the cam will Vrotate. the inner tele- 115 scoping memberinto position so that the lielixes on the-members can engage.tlie'heliXes engagethe telescoping member member. yThe inner telescopingmember will rotate by the action of the continually applied"V pressureof tric plunger- While the member 12 is sliding fdown over .the inneritelescopin'g member, the metal will be forcedy Vdown over the topof-theAiXed forming member, asv shown in Figure 3.

The ejecting-plungerv will then come into.

contact with thetop ofthe form. and hold it for the piercing operation.Further move- Vment forces the metal up into Vthe female form and at thesame time the excess material 36v will be sheared jotfaround-.the,circle 36a,

Ybecause the plunger forces themetal over the shearing' edgelQf of thetelescoping member .12. rlhe holeBGb-will also be pierced, and the partswill then be ink the position as .shown in Figure 4. 1

l'causes the piston' to rise. 40

The plunger will then return upward. Air is admitted to thehydraulicv,cylinder and With the rising of thepiston the blankv holder movestowards its-'initial position. The Vcam is .also movedi up-by thepiston.' Pressure having been taken oft' of the telescoping member 12,the springs 13,0 react and force it to its vuppermost position.

Y'11b will lalso react on the pin 11 and rotate the inner telescopingmember until it will be inthe position with the telescoping member' 12resting on the. flat tops of the h'elixes on the inner telescopingmember. s Y

- The formv will risefwith the plunger, and

a fixed member on the press ram. The plate with its rods will pushonthev ejecting plunger, which in turn will then push on the lform vandeject it from'the plunger.v All parts will then be in position, as shownin Figure 1.-.

v,Opewrtz'o'a `0.7 toggvleiprcs'a forimagv 25002 vA sheet of'metal islaid on top of the die. NrThe punch is -moved 46 securely clamps'- A thedie. A disc of first forming member and is then 'pushed'i'nto downwardand the disc the-'metal to the top of metal is'sheared by the `and thesleeve so' When telescoping ,Simultaneously vthespring in the slotplunger. when 1t hasreached .a certain point in upward travel, the stud27a will come in contact with the largest diameter of the idie, as shown-in .Figure 15.

The forming member 48 then pushesthe partly formed shell intov the nextsmaller diameter ofthe die, as shown in Figure 16. VVhen` the plungerreaches this i position','the fingerjwill have come in lcontact with thecam, vwhich will g rotate the-collar i *i that the helixes can mesh andallow the shaft to push theshell down It will be understood from the'description that-the sleevev cannot godown into the forming. memberuntil the collar has rotated the helixes into. position .for meshing.

Y y When the plunger returns upward the colilar will rotate the sleeveup out ofthe-form-` the top ofthe forming member.- Further upwardmovement brings the parts up out of the die, and` when the position aslshown in Figure 14.. n y Having thus described my invention, what Iclaim as new and desire to secure by Letters Patent,-is:V y y. .l .f .f-

1. In sheet forming apparatus comprising a forming die member and arforming punch they .are out airis admitted" rinto the cylinder' and thedisc will return-to farther intothe die, as shown'in igure17.

'-ing member/-wheieit will again seat itself on member, each havingelements of successively decreasing cross dimensions, elements` of jonemember successively coacting. with respective elements ofthe othermember by relative recession of the elementsof l.one

`member incident to relative approachfof the members, and frictionallycoacting means controlling the relative recession of the elementsinitially having a positive coaction -to prevent the relativerecession,fmeans operated incident to relative approach of'the members,acting on the controlling means to initiate the Africtional coaction,said-control"- ling means being. operative independently of theinitiating means after. initiation of its vfrictional coaction, andmeans to return-the elements and the initiating means to: their initialrelative positions upon relative recession of said dieand punchmembers.-

. 2. Apparatus' as set forth in'v claim in.

which the means to return the elements com-- prises a spring,'and theImeans to" return the initiating means comprises a Viiuid actuated C1515,3. Apparatus as set forth in claim 1 in y which the vrecessioncontrollingmeans comprises an element rotatable relatively torone of.the receding element-s, said rotatable -elementand said receding elementh aving mutually engaging helical portions thev friction between which,inconjunc'tion with the' friction of rotation of the rotatable element,provide the .control of recession of said receding element, and in which.the initiating"V means comprises an extension on said rotatableelementand a cam engaging'said extension.

4; Apparatus as set forth in claim 1 in which they recession-controllingmeans comprises an elementrotatable relatively to one i ofthe recedingelements,'said rotatable element and saidreceding element havingmutually engaging helical portions the friction between which, inconjunction with the friction of rotation ofthe rotatable element,provide'. `the control of recession of said receding ele-r which thereturning means comprises aj spring acting upon said rotatable v.elementsubstantially in the plane of its rotation.

prises an element. rotatable relatively `to one of the recedingelements, said rotatable ele-4 ment and said receding element having mutually engaging helical; portions the `friction between which, inconjunction lwith the fricf tion of rotation of the rotatable element,provide the control of reces'ssion of said receding element; and inwhich the :initiating means comprises an extension on said rotatableele# ment and a cam engaging said extensiomand in which the returningmeans comprisesa spring actingv on thev receding element inV directionopposite to its recession.

6. Apparatus as set forth in claim llin which the recession controllingmeans comprises an element rotatable relatively to one Y of the recedingelements, said rotatablevelement and said receding element havingmutually engaging helical portions 4the friction between which, inconjunction with the friction of rotation of the rotatable element.providethe control of recession of said re-4 ceding eleinent, and'inwhich the initiating meansrcomprises an extension on said rotatableelement and a *camV engaging said extension, and in whichthe meansreturning v the rotatable element'and the receding element comprisesraspring, Vand the means to return the initiating means comprises al fluidactuated plunger acting on the cam. 7. Apparatus as set forthv in claim1 i Vwhich the recession controlling means comprises an elementrotatable relatively to `one of the recedingy elements, said rotatableelement land said receding element having mutually engaging helicalportions' the fric tion between which, in conjunction vwith the frictionof rotation of the rotatable element,

provide the control of recession of said re-- ceding element, and inwhich the initiating means comprises an eirtensionon` said rotatableelement and a cam engaging said eX- tension, and in which the meansreturningl the rotatable element and the receding element -comprises aspring acting on the rotatable element substantially ina plane of itsrotation, and a second spring acting on the receding element indirection opposite to' its recession. e.

' 8. Apparatus'as set forthin claim l in end permitting thecam to maiwhich 'therecession controlling means com# prises an element rotatablerelativelyvto. one

ofthereceding elements, said l rotatable ele- ,i

inent'and said receding element having mu?1 tually,l engaging helicalportions the friction,

betweenjwhich,in conjunction with the fric"y in which the meansreturning the rotatable g elementy and the're'ceding element comprises"j 5. Apparatus asset forth lin claim 1in which the recession controllingmeansfcom-Y a spring acting on therotatableele'ment sub stantiallyin aplane of itsfirotation, and a second spring acting on the'V recedingelement y in *directionl oppositev to its recession, 'and'in whichthesmeans to -returiithe initiating ing on, the cam.

s 1.9; Apparatus as sa forth il claim yifin means comprises a fluidactuated plunger actwhich thev forming punch member has therelativelyreceding elements andis'surrouiidled by a blanking die,and theforming die member is eXteriorly formed as a blanking punch coactingwith the blanking die prior to the first forming coaction, and includinge a blank holderin the blanking die which re-` cedes in blank holdingcoaction. with the forming die and by its recession operates theinitiating means to initiate the frictional cothe means that returnswhich the recession controlli-ng means com-V prises an element rotatablerelatively to one: i*

ofthe receding elements, said rotatable elee ment and said recedingelement having mutually engaging helical portions the friction betweenwhich, inconjunction withthe y friction of rotation-of the rotatableelement,

provide thefcontrol of recession of the recedingvelement,and including,a brake Viii frictional contact with said rotatable element,

means having a yielding pressure onL said `brake to holdit in saidcontact, and means for adjusting said pressure. Y*

11. rApparatus as setforth in claimjl in which the initiatingmeanscomprises a' cam having :means for adjusting` its effective lengthand operating Ameans advanced Ain-v cident to relative approach of themembers,

engaging one end of the cam,and in which its advancedpositiomsaidcamhaving its opvthe means for` Vreturning the initiatingmeans f comprises a fluid-actuated plungerconnected to` andvreturningsaid operating means from posite end yielding and engaged Vbysaidl JlunfrerV for return of the 'cam C! said yielding. y ntain contactwith the plunger and said operating means vat various adjustnientsofitsvedvectyive length.

`121Insheet forming apparatus, a k'fixed centralforming punch element,an elementl rotat-able around said punch, -a forming,y

ierivr Y the punch eleinents, and means punch l element. surroundingancl` Vadapted A recede relative toSaicl central punch'element androtatable' element, saicl surrounding punch element andv saidvrotatableV element having `-mutually.engaging helical portionscontrolling recessionV of' :the forming velement by rotation of therotatable eleinentfand inif- Y tially inunniesheol engagement,positively preventing" vrecession of said forming kelement, a formingveo die having interior elements to coact, respectively,Withs'aiclfcentral' punch element and with sailjsurrountling punch ele-Y saicl rotatable element4 flSfAppai-atus' as set forth iny claim 12 linWhichjthe surrounding punch element initially'extends past the centralpunch element to `coact with itsy respective die element previousto'coaction of the centralfpunch element With its', respective` dieelement.

'and the forming Volie 1s eX;

a blankinig' die,

as a blanking punch coacting triorlyformed With the ing coactlion, andincluding a vblank holder intheblanking die whichr recedes in blankholding coaction `Withtheforrning die and constitutes'a transmissionelement by means n forth in 'claim 1.2 in which the punchelements aresurroundedrby blanking die prior to thefrst form Y of which the'foriningdie actuates the cani v means, and theV initially extending past thecentral punch ele` inent' to effect the' lirst forming coaction,previous to coacti'onlof the central punchelement with its respectivedieelement. f f

-z JAMESLAWRENGEAUBLE. Y

surrounding punchelement n v

